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Self
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Ascending and Descending
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Balcony
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Belvedere
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Blowball
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Bond of Union
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Castrovalva
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Circle Limit II (altro-colore)
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Concentric Rinds
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Day and Night
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Depth
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Development II (colore)
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Doric columns
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Double Planetoid
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Drawing Hands
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Encounter
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Eye
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Gallery
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Gravity
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Hand with reflecting sphere
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Hell, copy after Hieronymus Bosch
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Liberation
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Magic mirror
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Metamorphosis III - 4
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Moebius Strip II
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Other World
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Paradise
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Plane Filling I
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Puddle
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Relativity
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Rind
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Rippled Surface
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Smaller and Smaller
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Stars
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Sun and Moon
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Tetrahedral
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The fall of men
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Three Worlds
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Two intersecting planes
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Waterfall
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Whirpools
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